Ozone 4 is available now for Window and Mac (VST/RTAS/AudioSuite/AU/MAS/DX) for $249.99 USD. The upgrade from Ozone 1 and 2 is $99 USD, and $79 for Ozone 3 users (customers who purchased Ozone 3 in Oct 2008-Jan 2009 will get a free upgrade). A demo version can be downloaded here.